import React, { memo, useEffect, useState, useReducer } from 'react';
import PropTypes from 'prop-types';
import { cloneDeep, get } from 'lodash';
import { useParams } from 'react-router-dom';
import {
  BackHeader,
  getQueryParameters,
  LoadingIndicatorPage,
  LiLink,
  PluginHeader,
  PopUpWarning,
  getYupInnerErrors,
  request,
  templateObject,
} from 'strapi-helper-plugin';
import pluginId from '../../pluginId';
import { EditViewProvider } from '../../contexts/EditView';
import Container from '../../components/Container';
import ComponentField from '../../components/ComponentField';
import Inputs from '../../components/Inputs';
import SelectWrapper from '../../components/SelectWrapper';
import createYupSchema from './utils/schema';
import setDefaultForm from './utils/createDefaultForm';
import getInjectedComponents from './utils/getComponents';
import init from './init';
import reducer, { initialState } from './reducer';
import { LinkWrapper, MainWrapper, SubWrapper } from './components';
import {
  getMediaAttributes,
  cleanData,
  mapDataKeysToFilesToUpload,
} from './utils/formatData';

import {
  getDefaultComponentValues,
  retrieveDisplayedComponents,
  retrieveComponentsLayoutsToFetch,
} from './utils/components';

const getRequestUrl = path => `/${pluginId}/explorer/${path}`;

function EditView({
  currentEnvironment,
  emitEvent,
  layouts,
  location: { pathname, search },
  history: { push },

  slug,
  plugins,
}) {
  const { id } = useParams();
  const abortController = new AbortController();
  const { signal } = abortController;
  const layout = get(layouts, [slug, 'contentType'], {});
  const isCreatingEntry = id === 'create';
  const attributes = get(layout, ['schema', 'attributes'], {});

  const components = retrieveDisplayedComponents(attributes);
  const componentLayoutsToGet = retrieveComponentsLayoutsToFetch(components);

  // States
  const [showWarningCancel, setWarningCancel] = useState(false);
  const [showWarningDelete, setWarningDelete] = useState(false);
  const [isSubmitting, setIsSubmitting] = useState(false);
  const [reducerState, dispatch] = useReducer(reducer, initialState, () =>
    init(initialState, layout, isCreatingEntry)
  );

  const state = reducerState.toJS();
  const {
    didCheckErrors,
    errors,
    componentLayoutsData,
    initialData,
    modifiedData,
    isLoading,
    isLoadingForLayouts,
  } = state;

  const source = getQueryParameters(search, 'source');
  const shouldShowLoader =
    isLoadingForLayouts || (!isCreatingEntry && isLoading);

  useEffect(() => {
    const fetchComponentLayouts = async () => {
      try {
        const data = await Promise.all(
          componentLayoutsToGet.map(uid =>
            request(`/${pluginId}/components/${uid}`, {
              method: 'GET',
              signal,
            })
          )
        );

        const componentLayouts = data.reduce((acc, current) => {
          acc[current.data.uid] = current.data;

          return acc;
        }, {});

        // Retrieve all the default values for the repeatables and init the form
        const defaultComponentValues = getDefaultComponentValues(
          components,
          componentLayouts
        );

        dispatch({
          type: 'GET_COMPONENT_LAYOUTS_SUCCEEDED',
          componentLayouts,
          defaultComponentValues,
          isCreatingEntry,
        });
      } catch (err) {
        // TODO ADD A TRAD

        if (err.code !== 20) {
          strapi.notification.error('notification.error');
        }
      }
    };
    const fetchData = async () => {
      try {
        const data = await request(getRequestUrl(`${slug}/${id}`), {
          method: 'GET',
          params: { source },
          signal,
        });

        dispatch({
          type: 'GET_DATA_SUCCEEDED',
          data,
          defaultForm: setDefaultForm(get(layout, ['schema', 'attributes'])),
        });
        fetchComponentLayouts();
      } catch (err) {
        if (err.code !== 20) {
          strapi.notification.error(`${pluginId}.error.record.fetch`);
        }
      }
    };

    // Force state to be cleared when navigation from one entry to another
    dispatch({ type: 'RESET_PROPS' });

    if (!isCreatingEntry) {
      fetchData();
    } else {
      dispatch({
        type: 'INIT',
        data: setDefaultForm(get(layout, ['schema', 'attributes'])),
        defaultForm: setDefaultForm(get(layout, ['schema', 'attributes'])),
      });
      fetchComponentLayouts();
    }

    return () => {
      abortController.abort();
    };

    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [id, isCreatingEntry, slug, source, pathname]);

  if (shouldShowLoader) {
    return <LoadingIndicatorPage />;
  }

  const toggleWarningCancel = () => setWarningCancel(prevState => !prevState);
  const toggleWarningDelete = () => setWarningDelete(prevState => !prevState);
  const redirectURL = search
    .split('redirectUrl=')
    .filter((_, index) => index !== 0)
    .join('');

  const redirectToPreviousPage = () => push(redirectURL);
  const handleConfirmDelete = async () => {
    toggleWarningDelete();
    setIsSubmitting(true);

    try {
      await request(getRequestUrl(`${slug}/${id}`), {
        method: 'DELETE',
        params: { source },
      });

      strapi.notification.success(`${pluginId}.success.record.delete`);
      redirectToPreviousPage();
    } catch (err) {
      setIsSubmitting(false);
      strapi.notification.error(`${pluginId}.error.record.delete`);
    }
  };

  const displayedFieldNameInHeader = get(
    layout,
    ['settings', 'mainField'],
    'id'
  );
  const pluginHeaderTitle = isCreatingEntry
    ? { id: `${pluginId}.containers.Edit.pluginHeader.title.new` }
    : templateObject({ mainField: displayedFieldNameInHeader }, initialData)
        .mainField;
  const displayedRelations = get(layout, ['layouts', 'editRelations'], []);
  const hasRelations = displayedRelations.length > 0;
  const fields = get(layout, ['layouts', 'edit'], []);

  const checkFormErrors = async () => {
    const schema = createYupSchema(layout, {
      components: componentLayoutsData,
    });
    let errors = {};

    try {
      // Validate the form using yup
      await schema.validate(modifiedData, { abortEarly: false });
    } catch (err) {
      errors = getYupInnerErrors(err);
    }

    dispatch({
      type: 'SET_ERRORS',
      errors,
    });
  };

  const handleChange = ({ target: { name, value, type } }) => {
    let inputValue = value;

    // Empty string is not a valid date,
    // Set the date to null when it's empty
    if (type === 'date' && value === '') {
      inputValue = null;
    }

    dispatch({
      type: 'ON_CHANGE',
      keys: name.split('.'),
      value: inputValue,
    });
  };

  const handleSubmit = async e => {
    e.preventDefault();
    const schema = createYupSchema(layout, {
      components: componentLayoutsData,
    });

    try {
      // Validate the form using yup
      await schema.validate(modifiedData, { abortEarly: false });
      // Set the loading state in the plugin header
      setIsSubmitting(true);
      emitEvent('willSaveEntry');
      // Create an object containing all the paths of the media fields
      const filesMap = getMediaAttributes(layout, componentLayoutsData);
      // Create an object that maps the keys with the related files to upload
      const filesToUpload = mapDataKeysToFilesToUpload(filesMap, modifiedData);

      const cleanedData = cleanData(
        cloneDeep(modifiedData),
        layout,
        componentLayoutsData
      );

      const formData = new FormData();

      formData.append('data', JSON.stringify(cleanedData));

      Object.keys(filesToUpload).forEach(key => {
        const files = filesToUpload[key];

        files.forEach(file => {
          formData.append(`files.${key}`, file);
        });
      });

      // Change the request helper default headers so we can pass a FormData
      const headers = {};
      const method = isCreatingEntry ? 'POST' : 'PUT';
      const endPoint = isCreatingEntry ? slug : `${slug}/${id}`;

      try {
        // Time to actually send the data
        await request(
          getRequestUrl(endPoint),
          {
            method,
            headers,
            params: { source },
            body: formData,
            signal,
          },
          false,
          false
        );
        emitEvent('didSaveEntry');
        redirectToPreviousPage();
      } catch (err) {
        const error = get(
          err,
          ['response', 'payload', 'message', '0', 'messages', '0', 'id'],
          'SERVER ERROR'
        );

        setIsSubmitting(false);
        emitEvent('didNotSaveEntry', { error: err });
        strapi.notification.error(error);
      }
    } catch (err) {
      setIsSubmitting(false);
      const errors = get(err, 'inner', []).reduce((acc, curr) => {
        acc[
          curr.path
            .split('[')
            .join('.')
            .split(']')
            .join('')
        ] = [{ id: curr.message }];

        return acc;
      }, {});

      dispatch({
        type: 'SET_ERRORS',
        errors,
      });

      strapi.notification.error(
        `${pluginId}.containers.EditView.notification.errors`
      );
    }
  };

  // return null;

  return (
    <EditViewProvider
      addRelation={({ target: { name, value } }) => {
        dispatch({
          type: 'ADD_RELATION',
          keys: name.split('.'),
          value,
        });
      }}
      checkFormErrors={checkFormErrors}
      didCheckErrors={didCheckErrors}
      errors={errors}
      moveRelation={(dragIndex, overIndex, name) => {
        dispatch({
          type: 'MOVE_FIELD',
          dragIndex,
          overIndex,
          keys: name.split('.'),
        });
      }}
      onChange={handleChange}
      onRemove={keys => {
        dispatch({
          type: 'REMOVE_RELATION',
          keys,
        });
      }}
      pathname={pathname}
      resetErrors={() => {
        dispatch({
          type: 'SET_ERRORS',
          errors: {},
        });
      }}
      resetComponentData={componentName => {
        dispatch({
          type: 'RESET_COMPONENT_DATA',
          componentName,
        });
      }}
      search={search}
    >
      <BackHeader onClick={() => redirectToPreviousPage()} />
      <Container className="container-fluid">
        <form onSubmit={handleSubmit}>
          <PluginHeader
            actions={[
              {
                label: `${pluginId}.containers.Edit.reset`,
                kind: 'secondary',
                onClick: () => {
                  toggleWarningCancel();
                },
                type: 'button',
                disabled: isSubmitting, // TODO STATE WHEN SUBMITING
              },
              {
                kind: 'primary',
                label: `${pluginId}.containers.Edit.submit`,
                type: 'submit',
                loader: isSubmitting,
                style: isSubmitting ? { marginRight: '18px' } : {},
                disabled: isSubmitting, // TODO STATE WHEN SUBMITING
              },
            ]}
            subActions={
              isCreatingEntry
                ? []
                : [
                    {
                      label: 'app.utils.delete',
                      kind: 'delete',
                      onClick: () => {
                        toggleWarningDelete();
                      },
                      type: 'button',
                      disabled: isSubmitting, // TODO STATE WHEN SUBMITING
                    },
                  ]
            }
            title={pluginHeaderTitle}
          />
          <div className="row">
            <div className="col-md-12 col-lg-9">
              <MainWrapper>
                {fields.map((fieldsRow, key) => {
                  if (fieldsRow.length === 0) {
                    return null;
                  }

                  const [{ name }] = fieldsRow;
                  const component = get(
                    layout,
                    ['schema', 'attributes', name],
                    {}
                  );
                  const componentMetas = get(
                    layout,
                    ['metadatas', name, 'edit'],
                    {}
                  );
                  const componentValue = get(
                    modifiedData,
                    [name],
                    component.repeatable ? [] : {}
                  );

                  if (
                    fieldsRow.length === 1 &&
                    component.type === 'component'
                  ) {
                    // Array containing all the keys with of the error object created by YUP
                    // It is used only to know if whether or not we need to apply an orange border to the n+1 field item
                    const componentErrorKeys = Object.keys(errors)
                      .filter(errorKey => errorKey.includes(name))
                      .map(errorKey =>
                        errorKey
                          .split('.')
                          .slice(0, 2)
                          .join('.')
                      );

                    return (
                      <ComponentField
                        {...component}
                        {...componentMetas}
                        addField={(keys, isRepeatable = true) => {
                          dispatch({
                            type: 'ADD_FIELD_TO_COMPONENT',
                            keys: keys.split('.'),
                            isRepeatable,
                          });
                        }}
                        componentErrorKeys={componentErrorKeys}
                        componentValue={componentValue}
                        key={key}
                        isRepeatable={component.repeatable || false}
                        name={name}
                        modifiedData={modifiedData}
                        moveComponentField={(dragIndex, overIndex, name) => {
                          dispatch({
                            type: 'MOVE_FIELD',
                            dragIndex,
                            overIndex,
                            keys: name.split('.'),
                          });
                        }}
                        onChange={handleChange}
                        layout={get(
                          componentLayoutsData,
                          component.component,
                          {}
                        )}
                        pathname={pathname}
                        removeField={(keys, shouldAddEmptyField) => {
                          dispatch({
                            type: 'ON_REMOVE_FIELD',
                            keys: keys.split('.'),
                            shouldAddEmptyField,
                          });
                        }}
                      />
                    );
                  }

                  return (
                    <div key={key} className="row">
                      {fieldsRow.map(({ name }, index) => {
                        return (
                          <Inputs
                            autoFocus={key === 0 && index === 0}
                            didCheckErrors={didCheckErrors}
                            errors={errors}
                            key={name}
                            keys={name}
                            layout={layout}
                            modifiedData={modifiedData}
                            name={name}
                            onChange={handleChange}
                          />
                        );
                      })}
                    </div>
                  );
                })}
              </MainWrapper>
            </div>
            <div className="col-md-12 col-lg-3">
              {hasRelations && (
                <SubWrapper
                  style={{ padding: '0 20px 1px', marginBottom: '26px' }}
                >
                  <div style={{ paddingTop: '22px' }}>
                    {displayedRelations.map(relationName => {
                      const relation = get(
                        layout,
                        ['schema', 'attributes', relationName],
                        {}
                      );
                      const relationMetas = get(
                        layout,
                        ['metadatas', relationName, 'edit'],
                        {}
                      );
                      const value = get(modifiedData, [relationName], null);

                      return (
                        <SelectWrapper
                          {...relation}
                          {...relationMetas}
                          key={relationName}
                          name={relationName}
                          relationsType={relation.relationType}
                          value={value}
                        />
                      );
                    })}
                  </div>
                </SubWrapper>
              )}
              <LinkWrapper>
                <ul>
                  <LiLink
                    message={{
                      id: 'app.links.configure-view',
                    }}
                    icon="layout"
                    key={`${pluginId}.link`}
                    // url={`/plugins/${pluginId}/ctm-configurations/edit-settings/content-types/${slug}${`?source=${source}`}`}
                    url={`ctm-configurations/edit-settings/content-types${`?source=${source}`}`}
                    onClick={() => {
                      emitEvent('willEditContentTypeLayoutFromEditView');
                    }}
                  />
                  {getInjectedComponents(
                    'right.links',
                    plugins,
                    currentEnvironment,
                    slug,
                    source,
                    emitEvent
                  )}
                </ul>
              </LinkWrapper>
            </div>
          </div>
        </form>
        <PopUpWarning
          isOpen={showWarningCancel}
          toggleModal={toggleWarningCancel}
          content={{
            title: `${pluginId}.popUpWarning.title`,
            message: `${pluginId}.popUpWarning.warning.cancelAllSettings`,
            cancel: `${pluginId}.popUpWarning.button.cancel`,
            confirm: `${pluginId}.popUpWarning.button.confirm`,
          }}
          popUpWarningType="danger"
          onConfirm={() => {
            dispatch({
              type: 'RESET_FORM',
            });
            toggleWarningCancel();
          }}
        />
        <PopUpWarning
          isOpen={showWarningDelete}
          toggleModal={toggleWarningDelete}
          content={{
            title: `${pluginId}.popUpWarning.title`,
            message: `${pluginId}.popUpWarning.bodyMessage.contentType.delete`,
            cancel: `${pluginId}.popUpWarning.button.cancel`,
            confirm: `${pluginId}.popUpWarning.button.confirm`,
          }}
          popUpWarningType="danger"
          onConfirm={handleConfirmDelete}
        />
      </Container>
    </EditViewProvider>
  );
}

EditView.propTypes = {
  currentEnvironment: PropTypes.string.isRequired,
  emitEvent: PropTypes.func.isRequired,
  history: PropTypes.shape({
    push: PropTypes.func.isRequired,
  }),
  layouts: PropTypes.object,
  location: PropTypes.shape({
    pathname: PropTypes.string,
    search: PropTypes.string,
  }),
  slug: PropTypes.string.isRequired,
  plugins: PropTypes.object,
};

export default memo(EditView);